In prepress and printing, an imposition or layout in which one plate contains all the images (pages) to be printed on both sides of a sheet. Once one side of a job has been printed, the pile of printed sheets is turned over, the edge of the sheet that was the gripper edge for the first side becoming the back edge for the second side. After printing, the sheet is cut in half, yielding two identical units. Work-and-tumble layouts, with their use of different gripper edges, may have registration problems. See also Work-and-Turn and Work-and-Twist. Also known as work-and-flop and work-and-roll.